How to Grow a Plum Tree
How to Grow a Plum Tree
By Conner John
Plums are a delicious fruit ready for harvesting at the end of the summer are an easy tree to grow. With some suitable for cooking and others ideal for eating fresh from the tree, all you need to do is choose the right plum tree for your garden.
Some plum trees can grow to thirty feet tall, some are available as small trees, others are suitable for growing in pots which are ideal for a very small garden and some are self-fertile, whilst others will need a pollinating partner, therefore you will probably need to do a little research to find the ideal plum tree to suit your particular needs.
Plum trees grow well in most types of soil provided it is free draining and they also prefer a year round moist soil, therefore if you have a very sandy soil, extra organic matter will be required to assist the soil in retaining moisture.
The site is also important as plum trees require a warm, sheltered position away from winds, in full sun and also away from any frost pockets. They will also not fare well if planted in any low lying ground that is likely to become water logged or near other trees who will effectively steal moisture from them.
Plum trees come as either bare rootstock which should only be planted when they are dormant from roughly October to March or in containers which can be planted at any time, although in both cases, make sure the ground is not waterlogged or frozen and again, in both cases, the very best month for planting is October whilst the ground is still warm after the summer sunshine and with the added benefit of the autumn rain which will help the plum trees settle into the ground.
To give the soil time to settle down prepare the ground a few weeks before planting by digging a large hole and mixing in plenty of compost or well-rotted manure with the removed soil, refilling and then finish off by sprinkling some slow release organic fertiliser on top.
How to Prepare the Plot and Plant your Plum Tree
Dig a hole in your earlier prepared soil that is both deep and wide enough to comfortably house the roots and then place your tree in the hole and spread out the roots. In the case of container grown trees, the tree needs to be planted to the same depth as it was in its container and for bare rootstock trees, plant to the same depth as the soil mark on its trunk or if that is not clear, make sure the joining point between the rootstock and the scion, which can be seen as a bulge in the stem, is about 2 inches above ground level (this also applies to container grown plum trees). Back fill with the removed soil, firming in well as you go to remove any air pockets, then water in well if the conditions are dry.
For the first few years your plum tree will also require some support by way of a stake which should be placed in the hole before the tree. The stake should be about 5 foot high and 2 inches in diameter and placed to a depth of about 2 foot below the ground with the remaining 3 feet above ground and with a space of about 6 inches between the stake and the tree. After planting the tree and back filling with soil as directed above, tie the trunk to the stake loosely with plastic or rubber ties (do not use anything, for example wire, which may cut into the trees trunk). Once the tree has settled in the ties may need tightening after a few weeks and as soon as the stem starts to grow and thicken you will need to make sure that the ties do not start to cut into the stem, loosening them as soon as they become too tight, this will usually be for the first couple of years or so.
If you are growing your plum tree in a pot then one with plenty of drainage holes will be necessary and of about 2 foot in diameter being the ideal size (but no less than 18 inches) and to help retain moisture and assist with drainage, place some small stones, horticultural grit or broken crocks in the bottom of the pot and then fill with a soil based compost, pressing down as you go to remove any air pockets. Sit the container on pot feet or bricks to allow for drainage in your chosen sunny site and water the plum tree in well.
How to Grow and Care for your Plum Tree
Your plum tree will need to be kept watered well during any hot and dry weather, paying particular attention to those grown in a pot, not allowing them to dry out.
Apart from keeping the base of your plum tree from weeds, a yearly sprinkling of a slow release organic fertiliser applied to the soil, followed by a two inch thick layer of mulch, spread canopy wide but avoiding the trunk, in early spring will give your plum tree a boost of nutrients as well as helping to keep moisture in and weeds out!
A particular problem with plum trees that a lot of people come across is that one year they will have a bumper harvest (which can sap the tree of strength and cause branches to snap off through too much weight), followed by a year of next to nothing. A regular yearly thinning should help keep things a bit more consistent and also help the fruits to develop a good size.
From about the middle of May, when the plums are starting to form, remove any diseased or damaged fruit and give any remaining fruit enough room to swell (preferably so that they do not touch each other as they get bigger). After about a month or so give your fruit a further thinning if necessary, when plums are mature they need a space of about one inch between them.
Pests and Diseases of the Plum Tree
The plum tree can be susceptible to diseases such as silver leaf, brown rot, blossom wilt, bacterial canker and pests such as, birds, wasps, aphids, and plum maggots.
How to Harvest your Plums
Plums will normally be ready for harvesting from August through to October depending on your chosen variety and will be at their best if left to ripen on the tree, therefore a regular checking over is essential so as not to miss any that have suddenly ripened. It should be fairly apparent when they are ready by their ripe scent and full colour or just by giving them a very gentle squeeze to test if they are soft.
Plums will bruise easily so take care when harvesting them. Now you can go ahead and enjoy your delicious fresh straight from the tree, or alternatively turn them into jams, preserves or chutney. A glut of plums can easily be frozen by removing their stones.
How to Prune a Plum Tree
Plum trees should only be pruned in the summer (ideally the middle of June) whilst they are still growing as winter pruning when they are dormant is likely to result in silver leaf disease.
The aim when pruning your plum tree is to obtain a nice, goblet shaped tree, with little in the way of foliage or branches in the centre and with the remaining branches growing upwards. To achieve this shape, once a year (June) cut out any shoots that are growing into the trees centre and to encourage more growth, outward growing branches should be hard pruned back.
The rootstock of your plum tree is liable to throw out suckers which should be cut out as soon as they appear by either cutting back to below ground level or ideally, dig out some of the soil, this will expose where the sucker is growing on the roots and then just pull it off.
This article was brought to you by Conner John, the marketing manager for Tree Surgeons Wimbledon, an arboricultural company based in Wimbledon. We provide all types of tree services including tree removal, pruning, stump grinding and 24hr emergency tree work. See our website for more information.
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